21971479174 has 8 divisors (see below), whose sum is σ = 32970393360. Its totient is φ = 10981348056.

The previous prime is 21971479111. The next prime is 21971479181. The reversal of 21971479174 is 47197417912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2189509 + ... + 2199520.

It is an arithmetic number, because the mean of its divisors is an integer number (4121299170).

Almost surely, 2^21971479174 is an apocalyptic number.

21971479174 is a deficient number, since it is larger than the sum of its proper divisors (10998914186).

21971479174 is a wasteful number, since it uses less digits than its factorization.

21971479174 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4391534.

The product of its digits is 889056, while the sum is 52.

The spelling of 21971479174 in words is "twenty-one billion, nine hundred seventy-one million, four hundred seventy-nine thousand, one hundred seventy-four".